2 LED Temperature Change Indicator with LM35 & 741

2 LED Temperature Change Indicator with LM35 & 741

This 2 LED Temperature change indicator shows us, by means of two LEDs, when the sensed temperature is above or below a set limit.

When the temperature is above the pre-set temperature level, LED D1 will light up and if it is below, LED D2 will light up.

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Differential Temperature Controller (PCB)

Differential Temperature Controller (PCB)

Differential Temperature Controller.

This circuit measures the temperature difference between 2 sensors and activates a relay when they are different. It is also possible to detect a temperature change, even when the two measured temperatures are normally different.

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Temperature gauge circuit using LM324 IC (PCB)

Temperature gauge circuit using LM324 IC (PCB)

Temperature gauge circuit using the LM324 IC

The temperature level is displayed using 4 LEDs:
A green LED indicates that the temperature is OK.
Two yellow LEDs indicate that the temperature is higher than normal.
A red LED indicates that the temperature is very high

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